20613505 has 16 divisors (see below), whose sum is σ = 27200448. Its totient is φ = 14872000.

The previous prime is 20613491. The next prime is 20613533. The reversal of 20613505 is 50531602.

It is a happy number.

It is not a de Polignac number, because 20613505 - 2⁵ = 20613473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5775 + ... + 8635.

It is an arithmetic number, because the mean of its divisors is an integer number (1700028).

Almost surely, 2^20613505 is an apocalyptic number.

It is an amenable number.

20613505 is a deficient number, since it is larger than the sum of its proper divisors (6586943).

20613505 is a wasteful number, since it uses less digits than its factorization.

20613505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20613505 is about 4540.2097969147. The cubic root of 20613505 is about 274.1893703951.

The spelling of 20613505 in words is "twenty million, six hundred thirteen thousand, five hundred five".